Reversible data hiding with optimal value transfer

1. Reversible Data Hiding With Optimal Value Transfer
ABSTRACT:
In reversible data hiding techniques, the values of host data are modified according
to some particular rules and the original host content can be perfectly restored after
extraction of the hidden data on receiver side. In this paper, the optimal rule of
value modification under a payload-distortion criterion is found by using an
iterative procedure, and a practical reversible data hiding scheme is proposed. The
secret data, as well as the auxiliary information used for content recovery, are
carried by the differences between the original pixel-values and the corresponding
values estimated from the neighbors. Here, the estimation errors are modified
according to the optimal value transfer rule. Also, the host image is divided into a
number of pixel subsets and the auxiliary information of a subset is always
embedded into the estimation errors in the next subset. A receiver can successfully
extract the embedded secret data and recover the original content in the subsets
with an inverse order. This way, a good reversible data hiding performance is
achieved.

2. EXISTING SYSTEM:
A data-hider can also employ histogram modification mechanism to realize
reversible data hiding. In the host image is divided into blocks sized 4 ×4, 8 ×8, or
16 ×16, and gray values are mapped to a circle. After pseudo-randomly segmenting
each block into two sub-regions, rotation of the histograms of the two sub-regions
on this circle is used to embed one bit in each block. On the receiving side, the
original block can be recovered from a marked image in an inverse process.
Payload of this method is low since each block can only carry one bit. Based on
this method, a robust lossless data hiding scheme is proposed, which can be used
for semi-fragile image authentication. A typical HM method presented for utilizes
the zero and peak points of the histogram of an image and slightly modifies the
pixel grayscale values to embed data into the image. In binary tree structure is used
to eliminate the requirement to communicate pairs of peak and zero points to the
recipient, and a histogram shifting technique is adopted to prevent overflow and
underflow. The histogram modification mechanism can also be implemented in the
difference between sub-sampled images and the prediction error of host pixels and
several good prediction approaches have been introduced to improve the
performance of reversible data hiding.

3. DISADVANTAGES OF EXISTING SYSTEM:
 In these reversible data hiding methods, a spare place can always be made
available to accommodate secret data as long as the chosen item is
compressible, but the capacities are not very high.
 Payload of this method is low since each block can only carry one bit.
PROPOSED SYSTEM:
In this paper, we will find the optimal rule of value modification under a payload-
distortion criterion. By maximizing a target function using iterative algorithm, an
optimal value transfer matrix can be obtained. Furthermore, we design a practical
reversible data hiding scheme, in which the estimation errors of host pixels are
used to accommodate the secret data and their values are modified according to the
optimal value transfer matrix. This way, a good payload-distortion performance
can be achieved
ADVANTAGES OF PROPOSED SYSTEM:
 A smarter prediction method is exploited to make the estimation errors
closer to zero, a better performance can be achieved, but the computation
complexity due to the prediction will be higher.

4.  The payload-distortion performance of the proposed scheme is excellent.
 The host image is divided into a number of subsets and the auxiliary
information of a subset is always embedded into the estimation errors in the
next subset. This way, one can successfully extract the embedded secret data
and recover the original content in the subsets with an inverse order.
SYSTEM CONFIGURATION:-
HARDWARE REQUIREMENTS:-
 Processor - Pentium –IV
 Speed - 1.1 Ghz
 RAM - 256 MB(min)
 Hard Disk - 20 GB
 Key Board - Standard Windows Keyboard
 Mouse - Two or Three Button Mouse
 Monitor - SVGA

5. SOFTWARE REQUIREMENTS:
• Operating system : - Windows XP.
• Coding Language : C#.Net
REFERENCE:
Xinpeng Zhang, Member, IEEE “Reversible Data Hiding With Optimal Value
Transfer” IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 15, NO. 2,
FEBRUARY 2013.